HAMNET

This article describes a wireless network. For Hamnet Shakespeare , son of William Shakespeare, see William Shakespeare # Early Years .

Antennas for HAMNET on the Kleiner Feldberg

HAMNET ( Highspeed Amateurradio Multimedia NETwork , spelling HAMNET ) is a radio and cable-based IP network developed and operated by radio amateurs . It serves as a high-performance backbone for the infrastructure of the amateur radio service that is already available and enables IP applications. HAMNET was intended as a gradual substitution of the existing packet radio network. Today, the HAMNET is already an integral part of amateur radio and exists parallel to the packet radio data radio developed in the 1980s.

aims

HAMNET represents a network between automatically working amateur radio stations . The network goes beyond local links of a region or country as an autonomous system ; it is linked transnationally so that an international basis for applications and users can arise.

All networks have the following goals in common:

• To encourage communication between radio amateurs and to promote self-construction and thus arouse and maintain enthusiasm for the technology of data transmission via radio links.
• To motivate radio amateurs to develop inexpensive, free hardware and software for highly efficient types of modulation with high bit rates , possibly in cooperation with universities in technical-scientific studies.
• To enable supraregional projects that impart knowledge and experience in IT basics, wave propagation, antenna technology and filter technology to the participants.
• To create synergies between old and young (knowledge transfer, location access, statics).
• To gradually replace or supplement the previous, narrow-band FSK packet radio network.
• To enable radio amateurs to have HAMNET access with high bit rates in the final stage.
• In the event of an emergency: the provision of emergency radio with a high data transmission capacity for the emergency services as a backup to commercial networks through UPS .

technology

HAMNET works on the basis of the Internet protocol family . The umbrella organization of HAMNET, Amateur Radio Digital Communications (ARDC), based in San Diego, has its own Class A IPv4 address space (IP addresses 44.0.0.0/8), which is also the name commonly used in the USA Network 44 for HAMNET. The data should mainly be transmitted via radio technology and certain commercially available WLAN routers that can be changed in terms of frequency or that can be used directly for HAMNET can be used for this purpose. The data transfer rate can be up to 65 Mbit / s.

In the context of HAMNET, the frequency ranges and channels available for general WLAN are not used directly, but spectrally adjacent areas which are approved for amateur radio. This means that no mutual interference occurs when conventional WLANs and HAMNET are operated in parallel. The frequency ranges used for the radio link between the HAMNET nodes are mainly the 6-centimeter band or the ISM band at 5.7 GHz. The access points for the amateur radio stations are mainly in the 13-centimeter band between 2.3 and 2.4 GHz.

development

The development towards a radio-based internet for radio amateurs that is slower than the wired internet began with the further development of data radio. Radio amateurs experimented with different families of protocols and adapted them to the conditions of radio technology. HAMNET is one of the first amateur radio network applications in which, in addition to a radio network, wired networks are an integral part of the amateur radio service.

HAMNET in Germany

In particular packet radio Digipeater, voice mailboxes, FM - relay stations , ATV -Umsetzer, D-STAR relay and paging transmitters are integrated into the current trial and development phase. The official start and presentation of the German project took place at the amateur radio trade fair and conference INTERRADIO on October 31, 2009 in Hanover under the name HAMNET 2.0, accompanied by appropriate lectures. In a further phase, club and school stations as well as user access are to be made possible.

The first HAMNET digipeaters are available in southern Bavaria, which are based on the conditions in Austria.

In western Germany, construction is being driven forward on the Lower Rhine and in the metropolitan areas of the Ruhr area, Düsseldorf and Cologne-Aachen.

Most of the German sub - networks are already connected to each other via VPN tunnels or radio links. The merger with HAMNET in Austria, Italy and Switzerland also took place over several transitions. The AS numbers and IP networks required for technical operation are coordinated and assigned by the "DL IP coordination in AMPR-Net".

A current overview of existing radio and cable connections in Germany (and the surrounding area) is available from the hamnetdb.net database.

HAMNET in Austria

The project has been run by members of the ÖVSV since 2005 and was originally called ALAN. After a few local tests and the recognition of its global importance, this new type of network was first presented as HAMNET in Vienna in 2008. The name for this project has its origins in Salzburg.

Today there is a functioning network with links that connect all federal states and numerous user accesses. Router boards from the manufacturer Mikrotik are used as node computers. Many packet radio links are switched via the HAMNET. There are also other applications, such as webcams , weather stations , web servers and propagation forecasts .

HAMNET in France

The radio amateur F4HDK has developed the "New Packet Radio" for the so-called "last mile" of the HAMNET. The modem mainly consists of the following components: voltage regulator, Ethernet interface, a microcontroller and a transceiver. The modem sends on the 70 cm band . Due to the propagation characteristics of the frequencies around 435 MHz, connections without a direct view of the remote station (HAMNET user access) are also possible. Transmission speeds of up to 500 kbit / s are possible with the modem. The first concepts for such a modem already existed in Austria under the names HHD70 and HRD70.

HAMNET in Switzerland

The project is operated by the SWISS-ARTG Swiss Amateur Radio Teleprinter Group and the USKA .

Trivia

Hamnet was also the name of the son of the playwright William Shakespeare .

Web links

• HAMNET in the amateur radio wiki of the German Amateur Radio Club and the Adacom professional association for amateur data radio e. V.
• Introduction to HAMNET - data network for HAMs
• HamNet homepage of DO4BZ / District H
• HamNet homepage from DB0RES
• Wiki of the AS numbers and IP network coordination DL
• Hamnet IP database and OSM based map of the node locations and radio links.

Individual evidence

1. ↑ Home page of the DL IP coordination for radio amateurs . Retrieved November 27, 2011.
2. ↑ Frequency overview in the wiki of the amateur radio station DB0FHN . Retrieved August 29, 2012.
3. ↑ Frequency overview in amateurfunk-wiki.de . Retrieved June 15, 2015.
4. ↑ Overview in the amateur radio wiki of DARC eV and ADACOM eV . Retrieved May 29, 2012.
5. ↑ Overview in the Wiki for the Ruhr district . Retrieved July 26, 2010.
6. ↑ Forum of the working group HAMNET-West  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. . Retrieved July 26, 2010.  
7. ↑ Wiki of the DL IP coordination for radio amateurs . Retrieved July 26, 2010.
8. ^ Hamnet IP database . Retrieved June 15, 2015.
9. ↑ Wiki of the ÖVSV . Retrieved April 10, 2010.
10. ↑ HAMNET network plan
11. ↑ For details including a list of numerous original sources, see en: Hamnet Shakespeare (English)